// jquery.innerfade.js
// Datum: 2008-02-14
// Firma: Medienfreunde Hofmann & Baldes GbR
// Author: Torsten Baldes
// Mail: t.baldes@medienfreunde.com
// Web: http://medienfreunde.com

(function ($) {

  $.fn.innerfade = function (options) {
    return this.each(function () {
      $.innerfade(this, options);
    });
  };

  $.innerfade = function (container, options) {
    var settings = {
      'animationtype': 'fade',
      'speed': 'normal',
      'type': 'sequence',
      'timeout': 2000,
      'containerheight': 'auto',
      'runningclass': 'innerfade',
      'children': null
    };
    if (options) $.extend(settings, options);
    if (settings.children === null) var elements = $(container).children();
    else var elements = $(container).children(settings.children);
    if (elements.length > 1) {
      $(container).css('position', 'relative').css('height', settings.containerheight).addClass(settings.runningclass);
      for (var i = 0; i < elements.length; i++) {
        $(elements[i]).css('z-index', String(elements.length - i)).css('position', 'absolute').hide();
      };
      if (settings.type == "sequence") {
        setTimeout(function () {
          $.innerfade.next(elements, settings, 1, 0);
        }, settings.timeout);
        $(elements[0]).show();
      } else if (settings.type == "random") {
        var last = Math.floor(Math.random() * (elements.length));
        setTimeout(function () {
          do {
            current = Math.floor(Math.random() * (elements.length));
          } while (last == current);
          $.innerfade.next(elements, settings, current, last);
        }, settings.timeout);
        $(elements[last]).show();
      } else if (settings.type == 'random_start') {
        settings.type = 'sequence';
        var current = Math.floor(Math.random() * (elements.length));
        setTimeout(function () {
          $.innerfade.next(elements, settings, (current + 1) % elements.length, current);
        }, settings.timeout);
        $(elements[current]).show();
        } else {
        alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
      }
    }
  };

  $.innerfade.next = function (elements, settings, current, last) {
    if (settings.animationtype == 'slide') {
      $(elements[last]).slideUp(settings.speed);
      $(elements[current]).slideDown(settings.speed);
    } else if (settings.animationtype == 'fade') {
      $(elements[last]).fadeOut(settings.speed);
      $(elements[current]).fadeIn(settings.speed, function () {
        removeFilter($(this)[0]);
      });
    } else alert('Innerfade-animationtype must either be \'slide\' or \'fade\'');
    if (settings.type == "sequence") {
      if ((current + 1) < elements.length) {
        current = current + 1;
        last = current - 1;
      } else {
        current = 0;
        last = elements.length - 1;
      }
    } else if (settings.type == "random") {
      last = current;
      while (current == last)
      current = Math.floor(Math.random() * elements.length);
    } else alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
    setTimeout((function () {
      $.innerfade.next(elements, settings, current, last);
    }), settings.timeout);
  };

})(jQuery);

// **** remove Opacity-Filter in ie ****


function removeFilter(element) {
  if (element.style.removeAttribute) {
    element.style.removeAttribute('filter');
  }
}